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mail:see postal servicepostal service,
arrangements made by a government for the transmission of letters, packages, and periodicals, and for related services. Early courier systems for government use were organized in the Persian Empire under Cyrus, in the Roman Empire, and in medieval Europe.
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Dispatches of correspondence and other objects tendered by and intended for delivery to postal administrations (ICAO).
the hard protective shell of such animals as the turtle and lobster
(2) (Mail) The email clients in the Mac and Windows. Mail was the name of the Mac client before Microsoft adopted it for Windows 8. See Mac Mail and Windows Mail.